ColdPruf Men's Expedition Base Layer 1/4 Zip Mock Neck Top Heavyweight, single layer fleece base layer top 1/4 zip mock turtleneck with hemmed cuffs and drop tail Tagless labeling and flat seems provide a smooth fit and extra comfort Moisture management wicks perspiration and dries quickly Fits loose on the body, generous cut for full range of motion. For best fit wash before wearing Perfect on their own or as a base layer, mid or outer layer. Best used when dressing with minimal layers in very cold to extremely cold weather and medium to high activity levels